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Self-Locking Mailer Boxes

Ship your products securely and turn some heads along the way. Postal boxes boast a self-locking bottom and plenty of branding space.
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Hack your packaging process with self-locking boxes that are ready to post.

  • 3 size options
  • 1.8 mm white or brown E-flute cardboard
  • Inside & outside printing available
  • Self-locking bottom
  • Tuck-top lid
  • Recyclable

Convenience & confidence

With self-locking boxes (also known as crash-lock boxes), the bottom of the box automatically locks into place to ensure your products are secure during transit and storage. And with complete inside and outside printing available, you can really make your self-locking postal boxes stand out and get noticed everywhere they go.

Great for shipping & storage

Self-locking boxes are ideal for storing and shipping larger or multiple products. Available in 3 sizes in your choice of white or brown kraft E-flute cardboard, crash-lock postal boxes are a go-to for sample packs, corporate gifts, subscription boxes and more. What’s more, if you’re not sure about the size or look of your boxes, you can order 1 to start and then order more.

Intuitive design process

To get started, upload your design or brand logo. Once you’ve done that, you’ll be able to add backgrounds, colours or text to create your unique look. With our new 3D design studio, you can check your design from every angle before printing to make sure it’s what you want. After that, we’ll take over. Your self-locking postal boxes will be professionally printed, packaged and arrive ready to box out the competition.

Reviews

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Ratings Distribution

Reviewed by 1 customers

Excellent product

18 Dec 2024 | Paul | Verified Buyer
Excellent product and superb quality and reasonably priced and quality

Displaying Reviews 1-1

Work with a designer

Let us design it for you

No more guesswork. We take care of the entire design process, from brainstorming ideas to delivering the files to your account.

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Frequently asked questions

If you select brown kraft, you’ll be able to print across the entire exterior of the box. If you choose white kraft for your postal boxes, you’ll be able to print on the inside and outside.

Self-locking boxes (also known as crash lock boxes) are made of white or brown kraft E-flute corrugated cardboard and are 1.8 mm thick.

There is no minimum order quantity for self-locking postal boxes, so you can order as few as 1 or as many as you need.

The small box arrives pre-assembled. You only have to crease the folds of the box. The medium and large boxes include an adhesive strip which you apply to secure the locking bottom.

Please see the size chart tab above for details.